/*********************************************************************************
 *      Copyright:  (C) 2025 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  named_socket_client.c
 *    Description:  This file 
 *                 
 *        Version:  1.0.0(19/03/25)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "19/03/25 20:09:56"
 *                 
 ********************************************************************************/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#define SOCKET_PATH "/tmp/socket.domain"
#define MSG_STR "Hello, Unix Domain Socket Server!"

int main(int argc, char **argv)
{
	int conn_fd = -1;
	int rv = -1; 
	char buf[1024];
	struct sockaddr_un serv_addr;

	conn_fd = socket(AF_UNIX, SOCK_STREAM, 0);
	if(conn_fd < 0)
	{
		printf("create socket failure: %s\n", strerror(errno));
		return -1;
	}

	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sun_family=AF_UNIX;
	strncpy(serv_addr.sun_path, SOCKET_PATH, sizeof(serv_addr.sun_path)-1);

	if( connect(conn_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
	{
		printf("connect to unix domain socket server on \"%s\" failure: %s\n", SOCKET_PATH,
				strerror(errno));
		return 0;
	}
	printf("connect to unix domain socket server on \"%s\" ok\n", SOCKET_PATH);

	if( write(conn_fd, MSG_STR, strlen(MSG_STR)) < 0 )
	{
		printf("write data to unix domain socket server on \"%s\" failure: %s\n", SOCKET_PATH,
				strerror(errno));
		goto cleanup;
	}

	memset(buf, 0, sizeof(buf));
	rv = read(conn_fd, buf, sizeof(buf)); 
	if(rv < 0)
	{
		printf("Read data from server failure: %s\n", strerror(errno));
		goto cleanup;
	}
	else if( 0 == rv )
	{
		printf("Client connect to server get disconnected\n");
		goto cleanup;
	}
	printf("Read %d bytes data from server: '%s'\n", rv, buf);
cleanup:
	close(conn_fd);
}

